/**
 * Copyright (C) 2007 The AsyncMail Group <asyncmail@googlegroups.com>
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *         http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.googlecode.asyncmail.smtpserver.handler.fastfail;

import com.googlecode.asyncmail.smtpserver.SMTPSession;

import java.net.UnknownHostException;

public class ReverseEqualsEhloHeloHandler extends ResolvableEhloHeloHandler {

    /**
     * @see com.googlecode.asyncmail.smtpserver.core.filter.fastfail.ResolvableEhloHeloHandler#isBadHelo(com.googlecode.asyncmail.smtpserver.SMTPSession,
     *      java.lang.String)
     */
    protected boolean isBadHelo(SMTPSession session, String argument) {
        try {
            // get reverse entry
            String reverse = dnsServer.getHostName(dnsServer.getByName(session
                    .getRemoteIPAddress()));
            if (!argument.equals(reverse)) {
                return true;
            }
        } catch (UnknownHostException e) {
            return true;
        }
        return false;
    }

}
